Machine for producing artificial stone.



No. 803,014. PATENTBD 0OT.31,1905.

- 11. McILRAVY.

MACHINE PORPRODUOING ARTIFICIAL STONE.

APPLICATION FILED APR.11. 1905.

2 SHEETS-SHEET 1.

No. 803,014. PATENTED OCT. 31, 1905. D. MQILRAVY.

MACHINE FOR PRODUCING ARTIFICIAL STONE.

APPLICATION FILED APR. 11, 1905.

2 SHEETS-SHEET 2 UNITED STATES DAVID MOILRAVY, OF RICEVILLE, IOWA.

MACHINE FOR PRODUCING ARTIFICIAL STONE.

Specification of Letters Patent.

Patented Oct. 31, 1905.

Application filed April 11, 1905. Serial No. 254,924.

To all whom it may concern:

Be it known that I, DAVID MGILRAVY, a citizen of the United States,residing at Riceville, in the county of Mitchell and State of Iowa, haveinvented certain new and useful Improvements in Machines for ProducingArtificial Stone; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to machines for producing artificial-stonebuilding-blocks; and its object is to provide a simple and inexpensivedevice of this character which can be easily manipulated and which hasmeans whereby a block can be readily shaped and subsequently removed.

Another object is to provide a mold formed of removable panels formedand assembled in such a manner as to substantially prevent material fromadhering thereto, so as to necessitate frequent cleaning.

Another object is to provide cores for the mold which are adapted to beraised and lowered manually by means of simple mechanism provided forthat urpose.

With the above and other objects in view the invention consists of atable having an opening therein adapted to receive a base, from whichextend a desired number of cores. This base is supported by a slideadapted to be operated manually by means of levers connected to thetable, and means are employed for automatically locking the lever insuch a position as to hold the base when raised.

The invention also consists of a mold comprising a false bottom adaptedto be placed around the cores and to be surrounded by side and endpanels, which are secured by means of clamping devices provided forthem. The panels can be quickly removed from assembled position and thecores pulled downward, so that the false bottom can be carried to anydesired point with the formed block in position thereon.

The invention also consists of the further novel constructions andcombinations of parts hereinafter more fully described, and pointed outin the claims.

In the accompanying drawings I have shown the' referred form of myinvention.

In said rawings, Figure 1 is a perspective view of the machine, showingthe cores locked in raised position. Fig. 2 is a similar view showingthe cores in lowered position. Fig.

3 is an enlarged perspective view of the mold, the positions of thecores therein being indicated by dotted lines. Fig. 4 is a transversesection through the machine with the parts in position to receivematerial for forming a block, and Fig. 5 is a perspective view of aformed block in position upon a false bottom.

Referring to the figures by numerals of reference, 1 is the top of atable, having a preferably rectangular opening 2 therein, and this topis supported adjacent its corners by standards 3, suitably braced.Parallel guide-strips 4 extend downward from the center of each side ofthe top, and between them is mounted a cross-bar 5, to which are securedslides 6. Each slide has a projection 7 thereon, and these projectionsextend through slots 8, formed in levers 9, which are pivoted to thestandards 3 at one end of the table. The other ends of the levers areconnected by a cross-bar 10, which also forms a gri ,whereby the leversmay be readily raised or owered manually. A cross-strip 11 is securedbetween two standards and projects forward therefrom, and mounted withinthe ends of this strip are coiled springs 12, which constantly exert anoutward pressure upon locking-strips 13, which are pivoted to two of thestandards and have shoulders 14 for pro jecting under the levers 9 andsupporting them. The two locking-strips are connected to a treadle 15 bymeans of ropes 16, mounted on pulleys 17 in strip 11. It will thereforebe seen that when the treadle is depressed the two strips 13 will besimultaneously drawn inward and release the two levers 9. I

A base 18 is secured upon the cross-bar 5 and is of such size as to fitsnugly within the opening 2 when the levers 9 and the cross-bar 5 areraised. This base supports a plurality of cores 19 of any suitablecontour in crosssection and preferably tapered from their lower to theirupper ends.

The body of the mold used in connection with the machine comprises afalse bottom 20, having its ends reduced in thickness to form grips 21,and this false bottom is adapted to rest on the table and has openings22 for the reception of the cores 19. The side walls 23 ofthe mold areadapted to abut against the opposite edges of the false bottom 20 andare curved adjacent their ends, as shown at 24, for the reception of thebeveled edges of end walls 25. These end walls are preferably formedwith projecting portions 26,

IIO

ep ual in area and contour to onehalf of each o the cores 19. The sidewalls are held in place by stems 27, which project downward therefrominto openings 28, formed in the top 1, and are clamped upon the endwalls 25 by means of rods 29, having parallel extensions 30, whichoverlap the side walls and form pivots for cams 31. These cams areadapted to be locked against movement by means of pivoted loops 32,secured to the side walls or in any other suitable manner. Asuitably-finished lining 33 may be inserted into the mold so as tocontact with the inner surface of one side wall and give any desiredfinish to the formed block. It will of course be understood that the endwalls 25 may have projections 26 of any preferred outline anddimensions.

When it is desired to form a block by means of the machine hereindescribed, the. base 18 and cores 19 are raised by means of levers 9,and said levers are locked automatically by the strips 13. The falsebottom 20 is then placed upon the table with the cores projectingthrough openings 22, and the mold is set up around it in the mannerherein described. The cement or other material of whichthe block is tobe formed is packed within the mold and around the cores, and when it isdesired to remove the formed block the cams 31 are released from theirloops 32 and swung so as to release the rods 29. The side panels 23 canthen be swung laterally, as shown by dotted lines on Fig. 3, and raisedfrom engagement with the table, and the end walls 25 can also bewithdrawn from the ends of the block. Treadle 15 is subsequentlydepressed and causes the levers 9 to be simultaneously released. Saidlevers can then be forced downward and will pull the tapered cores 19out of the block and the false bottom. The block can then be conveyedupon the bottom 20 to any suitable place, where itcan be left to set.Another false bottom can subse quently be placed upon the table and theoperation above described repeated.

A machine such as herein described dispenses with the use of gearing,sprockets, and other like machine elements which become clogged by sand,gravel, &c., and are therefore quickly rendered inoperative. Moreover,the cores can be raised and lowered very easily, and therefore it isonly necessary to employ one man to operate each machine. It will ofcourse be understood that the linings 33 can have surfaces of differentcontours to produce blocks simulating cut stone, &c., or, if desired,the linings may be dispensed with.

In the foregoing description I have shown the referred form of myinvention; but I do not imit myself thereto, as I am aware thatmodifications may be made therein without departing from the spirit orsacrificing the advantages thereof, and I therefore reserve the right tomake such changes as fairly fall within the scope of my invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In a machine of the character described the combination with a tablehaving an opening in the top thereof, and guides connected to the tableand extending below the top; of a slide mounted within the guides, abase supported thereby and adapted to assume a position in the openingto close the same, a core upon the base, simultaneously-movable leversconnected to the slide, locking-strips adapted to automatically engagethe levers, and means for simultaneously retracting said strips fromengaging with the levers.

2. In a machine of the character described the combination with a tablehaving an opening therein; of guides extending at right angles from thetable, a slide movable within the guides, a base supported thereby andadapted to close the opening in the table, a core upon the base,operating devices connected to the slide and table, spring-controlledmeans for automatically locking the operating devices in one position,means for simultaneously retracting the locking means from engagementwith the operating devices, and a sectional mold upon the table andcomprising a false bottom mounted on the top and base, side and endpanels, and means for clamping the panels together, all of said panelsbeing separate and removable.

3. In a machine of the character described the combination with a tablehaving an opening therein of guides extending at right angles from thetable, a slide movable within the guides, a base supported thereby andadapted to close the opening, a core upon the base, operating devicesconnected to the slide and table, spring-controlled pivoted strips forDAVID MOILRAVY.

Witnesses:

J. S. POTTER, S. R. URE.

